Simple intuitive switch function,with instant switch to low modes, if required.1)Single press for Cool-white high mode,second press for Warm-white high mode.2) Holding the switch down In either mode will change from high to low power mode.Warm-\White for true colour rendition - great for BBQ and seeing true meat and foodcolours.3) IMPORTANT - The rechargeable battery Is removable and replaceable If required.If the rechargeable battery Is removed or replaced and the light does not function otter the battery is replaced,simply press the RESET button situated on the side cover opposite the battery compartment and then the on switch,to resume normal operation.USB recharging cable supplied,allow 5 to 8 hours for full recharge.